Spiral metallic hose.



E. WITZENMANN & E. STEIN.

SPIRAL METALLIC HOSE.

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967,260. Patented Aug. 16,1910.

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SPIRAL METALLIC HOSE.

APPLICATION FILED MAR. 30, 1909. 967,260, Patented Aug. 16, 1910.

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UNITED sTATEs PATENT oEEIcE.

EMIL WITZENMANN, 0F PFQRZHEIM, ANI)y EMIL STEIN, 0F CHARLOTTENBURG,

GERMANY.

SPIRAL METALLIC HOSE.

Specification of Letters Patent. Patgntgd Aug, 16, 1910,

Application led March 30, 1909. Serial No. 486,685.

To all ww'm it may concern:

Be it known that we, EMIL WITZENMANN, manufacturer, aisubject of the Grand Duke ofaden, residing at No. 4S Holzgarten- Strasse, Pforzheim, German Em ire, and EMIL STEIN, engineer, a subject 0I the Emperor of'Austria-Hunvary, residing at No. 28 Weimarerstrasse, harlottenburg, German Empire, have invented new and useful `Improvements vin Spiral Metallic Hose, of which the following is a specification.

This invention relates to flexible metallic hose and has for its .object to provide a hose consistingof spirally wound metal tape.

A further object of this invention is to provide a flexible 4metallic hose formed of metal tape spirally wound, said metal tape beingcurved in cross section, the spiral tape form'ing the hose being so shaped as to admit of a certain amount of extension and flexibility of the finished hose.

' A further object of this inventionl is to,

providea lexible'metallic hose formed of spirally wound metal tape curved or shaped 1n cross section and having the contiguous ed es of the spirally wound metal tape welded together.

- Withthese objects in view this invention consists in the production of a metallic flexible hose formed of spirally wound metal tape having the contiguous edges of the tape united by a continuous weld.

This invention further consists in providing a flexible metallic hose formed of spirally woundmetal tape and having the contiguous edges ofthe spirally wound metal tape united by a continuous weld in such manner that no packing is required along the contiguous edges of the spiral tape and in such manner that there are no seams or interstices through which leakage can occur.

Referring tothe accompanying drawings: Figures 1 and 2 illustrate the flexible metallic hose partly in longitudinal section and showing the contiguous edges of the spirally wound tape overlapping each other and welded together. Figs. 3 and 4 illustrate the exible metallicl hose having the contiguous edges of the spirally wound tape butt welded. Fig. 5 illustrates the flexible vmetallic hose havin the contiguous edges of the spirally woun tape bent outwardly and welded together. Fig. 6 is a view similar to Fig. 5 showing a small spiral tape covering the contiguous 'edges of the spirally wound tape and welded thereto. Fig. 7 illustrates the flexible metallic hose, the contiguous edges of thespi-rally Wound tape being covered by a small spirally wound tape and welded thereto, and Fig. 8 illustrates the flexible metallic hose in which the spirally wound metall tape is substantially U-shaped in cross section, the contiguous edges of the spirally wound metal tape being welded together.`

In Figs. l and 2 a. designates the spirally wound metal tape approximately U-shaped in cross section, the contiguous edges of the tape overlapping each other and welded together at b.

In Figs. 3 and 4 the spirally wound metal tape a is substantially U-shaped -in cross section and the contiguous edges of the tape are butt welded at o.

In Fig. 5 the spirally wound metal tape a2 is substantially U-shaped in cross section and the contiguous edges of the tape` are bent outwardly and welded together at b2.

In Fig. 6 thespirally wound metal tape a2 is ofY substantially the same shape in cross section as that shown in Fig. 5, and a small spiral tape b3 substantially U-shaped in cross section is arranged over the contiguous edges of the spirally wound metal tapey a2 and welded thereto, said spirally wound metal tapebs overlapping the edges of the spirally wound metal tape a2 as clearly shown.

In Fig. 7 a small spirally wound metal tape at overlaps the contiguous edges bt of the spirally wound metal tape a3 to which edges the tape a* is welded.

In Fig. 8 the spirally wound metal tape a5 is substantially U-shaped in cross section, the contiguous edges of the tape being welded together at b5.

While we have illustrated and described several different shapes of the spirally wound metal tape in each instance the tapes are 'curved in crosssection and the contiguous edges of the tape are united by a continuous spiral weld. This construction preseuts the advantage over other types of flexible metallic hose in that no packing is required for the reason that the contiguous edges of the spirally wound metal tape being united by a weld there are no open seams or interstices to be covered or closed and the hose is thereby continuous from end to end. By reason of this construction the hose can withstand enormous internal and external rpressures without a tendency to leakage while its subjection to high temperatures or sudden changes 1n -temperature does not affect the flexible hose for the reason that the contraction and expansion of the metal cannot aii'ect the hose to cause same to leak. These advantages are most material to this invention for by reason of this construction a lexible metallic hosecan withstand equal pressures and temperatures as a rigid metal pipe.

Flexible metallic hose composed of spirally wound metal tape having their contiguous edges packed and mechanically connected together are old and well known and we lay no claim to this construction, so also is a rigid pipe formed spirally and having the edges of the spiral Welded together old and well known and we lay no claim to the same.

What we d claim, however, and desire to secure by Letters vPatent of the United States, is

1. A flexible metallic hose comprising a spirally wound metal tape, said spirally wound Vmetal tape being curved in cross section, the 'contiguous` edges of the said spirally wound metal tape being welded together.

2. A flexible metallic hose comprising a spirally woundgfmetal tape substantially U- shaped in cross`section, the contiguous edges of said spirally wound metal tape being welded together.

3. A flexible metallic hose comprising a spirally wound metal tape curved in cross section and a continuous spiral weld for uniting the contiguous edges of the spirally wound metal tape. l

4. A flexible metallic hose comprising a spirally Wound metal tape curved in cross section, the contiguous edges of which tape are electrically welded.

5. A flexible metallic hose comprising'a spirally wound metal tape curved in cross section and a spirally wound metal tape overlapping the contiguous edges of the first mentioned spirally wound metal tape, the last mentioned spirallyfwound metal tape being Welded to the edges of the first mentioned spirally wound metal tape. y

6. A exible metallic hose comprising a plurality of alternating inwardly and outwardly extending folds substantially U- shaped in cross-section, the hose being made up of tubular sections the contiguous edges of which are Welded together.

7. A flexible metallic hose comprising a plurality of alternating inwardly and outwardly extending metal folds substantially U-shaped in cross section, the edges of which are welded together.

In witness whereof we have hereunto signed our names this 8th day of March 1909, in the presence of the subscribing witnesses.

EMIL WITZENMANN. EMIL STEIN. Witnesses as to Emil Witzenmann: B. WITZENMANN, K. HAFNER. Witnesses as to Emil Stein: WOLDEMAR HAUPT, HENRY HASPER. 

